giant timber bamboo vs Phyllostachys

giant timber bamboo and Phyllostachys both are nouns.

Word	Noun	Adjective	Verb	Adverb
giant timber bamboo	Yes	No	No	No
Phyllostachys	Yes	No	No	No

giant timber bamboo (noun)	Phyllostachys (noun)
large bamboo having thick-walled culms; native of China and perhaps Japan; widely grown elsewhere	medium and large bamboos